Journal of advanced researchSep 19, 2025

Gut bacteria’s role in how soluble fiber affects inflammation

Gut-Brain Axis Weekly Brief ↗PubMed ↗DOI ↗

Updated Jan 20, 2026

Abstract

Soluble dietary fiber (SDF) enhances intestinal barrier integrity and immune function.

SDF modulates gut microbiota composition, which is associated with increased production of beneficial microbial metabolites.
Short-chain fatty acids (SCFAs), along with other metabolites like 3-hydroxyoctadecaenoic acid and pentadecanoic acid, may play a role in immune regulation.
Current evidence suggests SDF could be therapeutically beneficial in managing chronic inflammatory diseases, including inflammatory bowel disease (IBD) and irritable bowel syndrome (IBS).
The mechanisms of SDF's effects, particularly in distant organs and neuroinflammatory conditions, are not well understood.

Simplified

Soluble dietary fiber (SDF) plays a significant role in modulating immune responses, particularly in the context of inflammatory diseases. SDF enhances intestinal barrier integrity and regulates immune function by modulating the composition of the gut microbiota and increasing the production of beneficial microbial metabolites, such as short-chain fatty acids (SCFAs), 3-hydroxyoctadecaenoic acid, pentadecanoic acid, and bile acids. Current evidence suggests that SDF holds therapeutic potential in managing chronic inflammatory diseases such as inflammatory bowel disease (IBD), irritable bowel syndrome (IBS), and metabolic dysfunction-associated steatohepatitis (MASH). Despite these promising findings, the mechanisms by which SDF exerts its effects, particularly in distal organs and neuroinflammatory conditions, remain poorly understood. This review explores the mechanistic pathways by which SDF modulates immune regulation and highlights the current challenges and future strategies for optimizing its clinical application in treating inflammatory diseases.